Apparatus for wrapping screw-type electrical terminals

ABSTRACT

The apparatus comprises a tubular member which is telescopically insertable over a standard terminal screw and which has a length such that it will extend down to the terminal on which the screw is mounted and still enclose the head of the screw when the screw is fully retracted or withdrawn. The tubular member is provided at its outer end with a projecting tongue for wrapping the end of a wire around the threaded screw post as the tubular member is turned. The tongue is preferably inclined toward the axial center of the tubular member and sharpened along its leading side edge in the direction of turn of the tubular member to enable it to bite into the wire and hold it while the tubular member is turned. A wire containing tubular cup or ring may initially be mounted on the terminal to facilitate the wire wrapping operation of the tubular member. The tubular member may be constructed to coact with a screwdriver to fasten the wrapped wire end.

lllnite mates Patent 11 1 llfiellems 111 3,7 1 Sept. 1, 1973 APPARATUSFOR WRAPPHNG SCREW-TYPE ELECTRHCAL TERMENALS [76] Inventor: David L.Kellems, 5842 Hilltop Rd,

Calabasas, Calif. 91302 22 Filed: Dec. 29, 1971 21 Appl. No.: 213,197

[56] References Cited UNlTED STATES PATENTS 4/1968 l2/l97l Dorsey.....29/203 H Kester 29/203 H Primary Examiner-Th0mas H. Eager Attorney-John.l. Hart et al.

[57] ABSTIRAT The apparatus comprises a tubular member which istelescopically insertable over a standard terminal screw and which has alength such that it will extend down to the terminal on which the screwis mounted and still enclose the head of the screw when the screw isfully retracted or withdrawn. The tubular member is provided at itsouter end with a projecting tongue for wrapping the end of a wire aroundthe threaded screw post as the tubular member is turned. The tongue ispreferably inclined toward the axial center of the tubular member andsharpened along its leading side edge in the direction of turn of thetubular member to enable it to bite into the wire and hold it while thetubular member is turned. A wire containing tubular cup or ring mayinitially be mounted on the terminal to facilitate the wire wrappingoperation of the tubular member. The tubular member may be constructedto coact with a screwdriver to fasten the wrapped wire end.

15 Claims, 15 Drawing Figures Patented Sept. 4, 1973 2 Sheets-Sheet 1VII/l;

Patented Sept. 4, 1973 2 Sheets-Sheet 2 F l G.

FIG.

APPARATUS FOR WRAPIPHNG SCREW-TYPE ELECTRICAL TERMINALS THE INVENTIONThis invention relates to apparatus for wrapping the ends of electricalwire connectors around standard screw type terminals provided inelectrical devices.

Electrical connectors of the type indicated comprise a screw threadedinto the terminal of an electrical or other device and having a head ofsufficient diameter to cover a conductor or wire end looped or wrappedabout the threaded shank of the screw. Solid wire con nectors often haveloops performed in the wires thereof before they are mounted on theterminals. If this is done manually by a screwdriver or a pair ofpliers, this is at best an awkward operation, and so much so, that manyelectricians in an attempt to make it easier, will strip off severalinches of the conductor insulation covering and use the end of theconductor as a tool to wrap the bare wire around the screw. Thishowever, results in a waste of the conductor material and does notprovide a very good terminal connection. Further, it cannot be followedin wiring many electronic devices and small machines in which theterminals are of necessity located in relatively difficult positions forapplying connectors, as for example in deep cavities in a machine, orfixture, or even in an electric clock. in such situations, the workermay partially preform a loop in the wire end before placing it aroundthe terminal screw, and then attempt to pull it around the screw with atool, but he is seldom able by this method to get a good 360 wrap of thewire around the screw. It is not unusual also, that wire ends which arepartially or fully performed into loops, are mounted on the terminals inthe wrong way so that as the terminal screws are tightened, the loopstend to unwind. Frequently, however, such solid wire connectors, as wellas all stranded conductors, are wrapped around the terminal screw shanksusing a screwdriver or a pair of pliers, or manually. In such practiceof what is probably the most common method the stranded conductorprovides a special problem, because when the bunched wires on theexposed end of such a conductor is applied around a terminal screw, theyhave a tendency to extrude or flow out from under the screw head as thescrew is tightened down on the terminal. This results in both a poorelectrical connection and a poor mechanical connection. Such aconnection will not conduct the full flow capacity of the conductor, andit can be pulled loose from the terminal rather easily. It has beenfound that it is not unusual for as much as 50 percent of the strands tobe out from under the terminal screw head unless the connection is verycarefully made. This constitutes a real hazard for the exposed wirestrands in the usage of the device can be spread out and frayed and comeinto contact with the strands of an adjacent terminal of the device tocause a short. Also where conditions of vibration exist in the usage ofthe device, a connection of this type will easily loosen up and becomedisconnected. The art has attempted to overcome this problem, byproviding a lug having an opening into which the bunched strands arepushed and then clamping the inserted strands by various means. Thismethod however, has not proved completely satisfactory, for in manyinstances in which it has been practiced, as in those situations wheresuch compression type terminations are not used, the tightening of theterminal screws will cause the portions of the bunched strands aroundsuch screws to be partially extruded and often broken to provide a weakconnection that is harzardous in use. The art has also attempted tosolve the problem by other methods, such as by making the screw headslarger and larger and using solder, but so far as I am aware no simple,inexpensive solution to the problem has as yet been devised by thoseskilled therein.

The primary purpose of my invention is to provide a simple, inexpensiveapparatus capable of quickly and readily wrapping both solid andstranded conductor ends around terminal screws so as to effect aperfect, strong electrical connection.

For a fuller understanding of the nature and objects of my invention, aswell as the advantages and novel features thereof, reference is made tothe following detailed description which should be read in conjunctionwith the accompanying drawings, in which FIG. 1 is a side elevation ofan apparatus embodying the invention;

FIG. 2 is a side elevation of the: body portion of the device shown inFIG. 1, partly in section, the detachable working end part of the devicebeing shown in dotted outline, and such figure illustrating the mannerin which a screwdriver may be used therewith;

FIG. 3 is an end elevation of the outer end of the detachable workingend part;

FIG. 4 is an end elevation of the inner attached end of such working endpart;

FIG. 5 is a side elevation of the detachable working end part, partly insection, said part constituting a small size in a set thereof;

FIG. 6 is a view similar to FIG. 5 of a larger size of working end partin such set;

W6. 7 is a view, in plan, showing the manner in which the working endpart coacts with a terminal screw in wrapping a wire end about thethreaded shank of such screw, the working end part being shown insection taken along the line 7-7 of FIG. 8;

FIG. 8 is a vertical view, partly in vertical section, of the partsshown in FIG. 7, and additionally showing the terminal in verticalsection, the lower end of the body portion of the device to which theworking end part is attached, and the lower end of a screwdriverextending through such body portion;

FIG. 9 is a view similar to H6. 8 showing the apparatus illustrated inthe latter figure coacting with a wire containing tubular cup to wrap astranded wire around the terminal screw;

FIGS. ill-M are perspective views showing different forms of wirecontaining tubular cups or rings that may be utilized in coaction withthe working end of the device shown in FIGS. l and 2 to wrap wire endsabout terminal screws; and

FIG. 15 is a sectional view showing how a screwdriver may be made anintegral part of the tool.

Referring now more particularly to FlGS. i and 2 of the drawings, itshould be first pointed out that the basic essential features of theapparatus of this invention relate to a tubular member 1111!, a tongue 1l integral with and projecting from the outer end of the tubular memberlltl, a tool shank 12 to which the tubular member 10 is connected, and ahandle R3 mounted on the shank 12. It will be understood that thetubular member R0 may be integral with and form the outer end part ofthe tubular shank l2 and that the shank 112 may be a solid rod of anysuitable cross-sectional configuration. In the construction illustratedin FIGS. I and 2 of the drawings, the tubular member I and itsassociated tongue I1 form the outer portion of a working end part whichis generally designated 14. The end part l4 may form part of a set ofsuch parts whose sizes are dependent on the sizes of the terminal screwsthat are usually encountered in electrical devices. Thus, for example, Ihave found that a set of six end parts having tubular members withinterior diameters ranging from approximately three-eighths inch toone-half inch will take care of most sizes of terminal screws used inelectrical devices or on machines. In the smaller sizes the end part 14may have a general configuration somewhat like that shown in FIGS. 1-5of the drawings, while in the larger sizes such parts may have a generalconfiguration such as shown in FIG. 6 of the drawings.

As is shown in FIGS. 1-6, each end part 14 is composed of an outertubular member 10, a tongue 11 and an inner attachment member 15, allintegrally formed from a single piece of suitable material such as toolsteel. The tubular member 10 has an interior cylindrical surface 16which is of uniform size throughout its length. The interior diameter ofthe tubular member 10 approximates that of the head 20,in FIGS. 7 and 8,of the terminal screw with which his to be used and is only sufficientlygreater than the screw head diameter to permit the screw head to movefreely in such memher as it is advanced or retracted without there beingmuch space therebetween. The tubular member 10 should have a length suchthat when the tongue 11 is in contact with the terminal 21, in FIG. 8,on which the screw is mounted, such member 10 will rise above the screwhead 20 in the fully retracted position on the terminal screw, as isillustrated in FIG. 8.

The inner attachment member or portion of end part 14, has a lengthapproximating that of the outer tubular member or portion 10 thereof andis provided with a socket 22 that is square-shaped in cross-section andwhich is terminated at its inner end by shoulders 23 that function asstops for the shank 12. The socket 22 receives the outer squared endportion 24 of the shank 12 which may be provided with a spring pressedbearing 25 to assure that the end part 14 will be retained in assembledposition on the shank during the handling of the tool. The other end ofthe shank 12 has mounted thereon a handle 13 of any suitableconfiguration and made of wood or plastic or any other suitablematerial. As is shown more clearly in FIG. 2 of the drawings, the shank12 is preferably made of a piece of metal tubing which extendsthroughout the length of the handle 13 and is secured to the ends of thelatter in any suitable manner. The bore 26 of the shank 12 which extendsthroughout the length thereof, including the end portion 24 of suchshank, and which is of uniform crosssectional area throughout itslength, has a diameter approximately the same as the interior diameterof the tubular member 10 which is the smallest end part 14 in the set ofsuch parts. Extendable through the shank l2 and through the tubularmembers 10 of the set of end parts is the shank of a screwdriver 28, asis illustrated in FIG. 2.

It will be understood from the foregoing discussion of the constructionof the tool, that in the use thereof, the bared wire end 30 of aconductor 31 is initially laid on the terminal 21 against the left handside of the threaded shank 32 of the terminal screw, as is shown in FIG.7 of the drawings. As indicated the length of the bared wire end 30 usedshould be greater than that of the chord bounding the segment of thetubular member 10 it will define so that when the tubular member H0 isinserted over the top of the screw the tongue 11 can engage the same ashort distance from the terminal end of such wire. As indicated, thisengagement of the tongue and wire will also be on the left hand side ofthe latter. While pressing down on the handle 13 of the tool to maintainthe tongue 11 in engagement with the top surface of the terminal 21, thehandle is turned in a clockwise direction, as viewed in FIG. 7, to bendthe bared wire end 30 around the screw shank 32. As is shown moreclearly in FIGS. 5 and 6 of the drawings, the tongue 11 is preferablyinclined inwardly toward the longitudinal axis of the tubular member 10so that in such turning movement of such member, the inclined tonguewill tend to sweep the wire closely around the screw shank 32 and underthe head 20 of the screw, as indicated in dotted outline in FIG. 7. Itwill be noted also, that during this turning movement of the tubularelement 10, the screw head 20 will function as a guide to maintain suchelement properly centered with respect to the screw shank and therebyprovide a uniform bending force on the wire. In the case of solid wireconductors, it is preferred also that the advancing or leading side edge33 of the tongue 11 be sharpened so that it will bite into the wire andbecome locked there-with. It has been found that the end of a solid wireneed only extend one-sixteenth of an inch beyond the leading edge 33 ofthe tongue when such leading edge is so sharpened. This method oflocking the tongue to the wire prevents waste and enables the formationof different types of eyelets or loops on the wire. It has also beenfound that in the formation of such a loop in a solid wire, the tonguell 1, as the tubular member 10 is turned, actually pulls the wire aroundunderneath the screw head 20. During this operation also, the operatorshould preferably grasp the body of the wire and releasably hold it backas the tubular member is being turned so that the bare wire end is heldagainst the screw shank 32. By turning the tubular element 10 through arange of from to 360, and/or by varying the position at which the tongue11 takes hold of the wire, varying different forms of eyelets or loopscan be made in the wire to obtain any type of termination desired. Withstranded types of wires, the sharpened edge 33 is not as important asthe inclination of the tongue 11, because the sharpened edge will notaffect such a secure hold on the wire strands. Thus, with stranded typesof wires it is preferred to project them initially a greater distancebeyond the tongue, as indicated in FIG. 8, and depend more on theinclined tongue wiping the strand ends around under the screw head andagainst the screw shank.

When a bared wire end, whether of a solid or stranded wire conductor, isproperly wrapped around the screw shank and under the head thereof, theoperator while maintaining pressure on the tool to hold the wrapped wirein position beneath the screw head, inserts the screwdriver through thebores of the tool shank l2 and the tubular element 10, and into the slotin the screw head as illustrated in FIG. 8 of the drawings. Thescrewdriver is then turned to tighten the screw head down on the wrappedwire end and secure the latter in place. As a result of these operationsa neat, physically strong, secure and good electrical connection ismade.

While it has been found that a good electrical connection will be madein the manner aforesaid, a better termination is possible in the case ofstranded wires with the aid of a wire containing cap used in the mannerindicated in FIG. 9 of the drawings. This result is attained becausesuch a cup will actually hold the wire strands in place underneath theterminal screw head so that when the screw is tightened, the strandedwires can be compressed tightly without the possibility of theirextruding out from under the screw head. Cups of the type that I havefound suitable for the purposes of the invention are shown in FIGS.III-M of the drawings; the cup shown in FIG. I0 being similar to the cupgenerally designated 35 in FIG. 9. It will be noted that all of the cupsillustrated are straight sided and of substantially uniform interiordiameter throughout at least that upper depth portion thereof throughwhich the head of the screw advances in compressing the strands tightlyagainst the bottom wall of the cup. Below such upper depth portion ofthe cup, the interior wall thereof may be gradually reduced in diameterto provide a slightly rounded configuration at the lower end of the cup.The interior diameters of these cups in such upper depth portionsthereof, of course, depend on size of the screw heads with which theyare to be used and are such that they form a fairly close fit with suchheads. This has been found to be important for if the interior diameterof a cup is appreciably greater than the screw head with which it is tobe used, there is the likelihood that some of the strands may come outthrough the resulting space therebetween and the full confining actionof the cup will be lost with a resultant weakened termination. Anotherfactor that is important is that the cup should be deeper than thelength of the tongue I I provided on the associated tubular member anddeep enough to completely encase the strands of the wrapped wire endwhen the screw head is advanced for tightened so that it is locatedbelow the upper edge of the cup. It has been found that desirabledimensions for these parts are a depth of approximately 7/32 It inch forthe cup and a length of approximately one-eighth inch for the tonguewill provide satisfactory wrapping results. Throughout the one-eighthinch depth of the upper portion of the cup, the interior diameter of thecup will be substantially uniform and only slightly greater than theoutside diameter of the screw head. The interior diameter of such upperportion should also be at least as great as the interior diameter of thetubular member 10 which shall be used to wrap the strands within the cupso that the inclined tongue I I provided on such tubular member It] canbe inserted into the interior of the cup and be moved around the screwshank while the outer edge of the tubular member It) is seated on theupper edge of the cup during the wrapping operation.

Considering now more particularly the showing of FIGS. 9 and I0 of thedrawings, it will be noted that the cup 35 has a tubularly shaped wall36 which is integral with a bottom wall 37 provided with a centralopening 38 of a diameter only slightly greater than the outside diameterof the threaded shank 32 of the terminal screw. The side wall 36 of thecup is cut away to provide a slot 39 that extends the depth of such walland is open at its upper end. The width of the slot 39 at its lower endis slightly greater than the outside diameter of the largest conductorthat would be used with such cups. The sides of the slot 39 taper orflare outwardly upwardly to facilitate the insertion of the conductorinto such slot. It will be observed in FIG. 9 of the drawings that inassembling a conductor with a cup, the strands 40 are laid on the top ofthe cup alongside the threaded shank of the screw so that the inner endsof the bared strand portions extend through the slot 39 and the outerends of the bared strand portions project beyond the opposite side ofthe cup, with such outer ends in uncompacted loose relation and notbunched. The tubular member I0 is then inserted over the screw head 20and the bent tongue II thereof inserted inside the upper portion of thecup 35. The tubular member I0 is then manipulated to enable the tongueII thereof to tuck the outer ends of the bared strands 40 into the cup35 and underneath the screw head 20. When this has been accomplished thescrew is tightened down by the screwdriver 2b in the manner previouslydescribed. During such tightening of the screw the bare wire ends d0cannot be extruded from beneath the screw head since they will be heldunder the head of the screw head by the cup 35. Consequently, the baredstrand ends can be compressed so tightly that they in effect becomecompacted together underneath the screw head to provide a very goodterminal from both the mechanical and electrical aspects.

The cups shown in FIGS. I I-Id have the same essential features as theabove described cup 35 shown in FIG. III. The cup of FIG. II differsfrom that of FIG. I0 in that the opening for the screw shank forms partof a slot II formed in the bottom wall 42 of the cup. This enables thecup to he slid into position on the terminal ZI, in FIGS. 8 and 9,without removing the screw.

The bottom wall M in the cup of FIG. I2 has been cut away at as toprovide an enlarged opening through which the screw head can beinserted. Thus, this cup too enables it to be mounted in proper positionon the terminal without disassembling the screw therefrom. Preferablythe cup of FIG. I2 is provided with a radial seat 46 which is arcuatelyshaped in transverse section. The portions of the bare wire endsextending through the wall slot will be locked in such seat when thescrew head is tightly secured down on the wrapped around portions ofsuch wire ends.

The cup shown in FIG. I3 of the drawings has a throat-piece d7associated with the slot db in the side wall 49 thereof. This throataffords a better control of the bunched strands as they are wrappedaround the terminal screw. It also coacts with one of the terminalprongs which is of course fixed, to prevent the cup and wrapped wireconnector from revolving around while the screwdriver is tightening thescrew head in place on the bared strands.

The cup shown in FIG. Id illustrates how a cup can be made to accomplishthe principal purposes of the cup construction of FIG. I3 using thematerial SIB which is cut away from the wall SI to form the slot 52.Preferably, the cut away piece or tongue SII is turned downwardly in acurved manner, to provide, it has been found, a better arc of the baredwire ends approaching the terminal screw and therefore a strongerconnection.

The aforesaid wire containing tubular cups depicted in FIGS. III-M maybe made of any suitable material such as aluminum, insulating material,brass, copper composition, etc. It is contemplated also that the screwand the cup can themselves function as a terminal in which case thecurrent would be caused to flow from the head of the screw, down throughthe threaded shank thereof to the cup made of electrical conductingmaterial. Terminals of this type have been found to be advantageous inelectronic apparatus, especially for use on the back of the terminalsfor the lead wires in television sets.

FIG. of the drawings, illustrates how the screwdriver may be made anintegral part of the tool to facilitate the coaction of the wrapping andsecuring operations. In this construction the tubular member isdesignated 55 and its associated inclined tongue is designated 56. Theinner end of the tubular member 55 is provided with a piston 57 that isslidably movable in a barrel 58. Provided on the tubular member againstthe outer side of the piston 57 is a ratchet wheel 59 which is normallymaintained in engagement with ratchet elements 60 fixed to theassociated end of the barrel by a spring 61 seated between the piston 57and a collar 62 fixed to the other end of the barrel. The collar 62 hassecured thereto one end of a screwdriver 63 which extends therefromthrough the barrel 58, a central opening in the piston 57 and the boreof the tubular member 55. The outer end of the collar 62 is providedwith a grooved head 63 on which is rotatably mounted the shank 64 of ahandle 65.

It will be understood that in the use of the tool of FIG. 15, the userwill grasp the handle 65 with the palm of one hand and press the outerend of the tubular member lightly against the wire to be wrapped on theterminal. The wrapping operation is accomplished by turning the barrel58 with the fingers of the same hand. Since the tubular member 55 islocked to the barrel 58 through the ratchet elements under the pressureof the spring 61, such tubular member will be turned as the barrel isturned. When the bared end of the wire is fully wrapped on the terminalscrew, the user exerts a greater pressure on the handle 65 sufficient todisengage the ratchet elements 59,60 and cause the piston 57 to slideupwardly in the barrel 58 against the yielding tension of the spring 61.The disengagement of the latching elements unlocks the connectionbetween the barrel 58 and the tubular member 55 which is retracted intothe barrel as the spring is compressed under the pressure applied to thehandle 65. As the tubular member 55 is retracted, the screwdriver 63 isadvanced into engagement with the head of the screw. Since thescrewdriver is permanently secured to the barrel 58, any continuedturning of the latter will cause the screwdriver to secure the screwhead against the wrapped bare wire end.

What is claimed is:

1. Apparatus for wrapping the bared ends of wire conductors on screwtype electrical terminals comprising a tubular member telescopicallyinsertable over the head of a standard terminal screw and having at itsouter end a projecting tongue for wrapping the bared end of a wirearound the threaded shank of the screw as said tubular member is turned,said tubular member having a length greater than the range of movementof the screw head in moving from a fully retracted position to itsadvanced wire securing position so that such tubular member enclosessuch screw head throughout such range of movement, said tubular memberhaving a substantially uniform diameter throughout said length, andmeans connected to said tubular member and operable to turn the latter.

2. Apparatus such as defined in claim I, in which said tongue bendsinwardly from the outer end of said tubular member toward thelongitudinal axis of said tubular member, the degree of bend of saidtongue being such that said tongue tends to sweep the engaged bared endof the wire closely around the screw shank as the tubu lar member *isturned.

3. Apparatus such as defined in claim ll, in which the leading edge ofsaid tongue in the direction of wrapping turn of said tubular member, isprovided with a sharp edge capable of biting into a bared wire end whensaid tubular member is turned to wrap the wire.

4. Apparatus such as defined in claim 1, in which said length of saidtubular member is the length of the outer portion of said member, andsaid member includes an inner attachment portion having a socketreceiving a male connecting part of said connected means, the inner endof said socket communicating with the opening in said outer portion ofthe tubular member, and the largest transverse dimension of said socketbeing at least as large as the diameter of the opening in said outertubular portion.

5. Apparatus as defined in claim 4, in which said connecting meansincludes a tubular shank having said male connecting part formed on oneend portion thereof and having an open bore extending throughout itsentire length, a tubular handle member mounted on the other end portionof said shank so that the bore in said tubular shank extends throughsaid handle member, the largest transverse dimension of said shank borebeing at least as large as the diameter of the opening in said outertubular portion.

6. Apparatus as defined in claim B, in which said connected meansincludes means formed to provide an open bore extending continuouslythroughout the entire length thereof, such bore being in communicationwith the opening in said length of tubular member and havings itslargest transverse dimension at least as large as the diameter of theopening in said length of tubular member, and a screwdriver operable tobe extendable from said bore and through said length of tubular memberinto engagement with the slot in a screw head enclosed by the latter.

7. Apparatus as defined in claim l, in which said tongue is inclinedtoward the longitudinal axis of said tubular member, and including awire containing cup which receives said inclined tongue and into whichis inserted the wire wrapped around the screw shank by said tongue, saidcup having a depth sufficient to receive all the wrapped wire and thehead of said screw and having a diameter in the upper screw headreceiving portion thereof such that the wrapped wire cannot be extrudedbetween the side wall of said cup and the outer periphery of the screwhead as the screw head is tightened down on the wrapped wire.

8. Apparatus as defined in claim 7, in which the side wall of said cupis notched to receive the conductor therethrough and in which the bottomwall of said cup is provided with an opening to receive the threadedshank of the screw.

9. Apparatus as defined in claim 8, in which the opening in the bottomwall of said cup is a slot extending radially to and communicating withthe bottom end of the notch in the side wall of said cup so that the cupmay be moved transversely into position against the screw shank.

10. Apparatus as defined in claim 8, in which the opening in the bottomwall of the cup is large enough to pass the screw head therethrough andhaving a reduced portion to receive the screw shank.

11. Apparatus as defined in claim 8, in which the side wall of the cupprovided thereon a stop member engageable with a fixed elementassociated with the cup to prevent rotation of the latter during thesecurement of the wire to the terminal.

12. Apparatus as defined in claim 11, in which said stop member isassociated with the notch in the side wall of the cup and is configuredto coact therewith as a guide for the wire being connected to theterminal.

13. Apparatus as defined in claim 12, in which said stop member issubstantially U-shaped in transverse section.

M. Apparatus as defined in claim 12, in which said stop member iscomposed of the material cut out to form the notch in the side wall ofthe cup and inclines downwardly from the bottom wall of the cup.

15. Apparatus as defined in claim 6, in which said connected meanscomprises a barrel, a piston slidably mounted in said barrel andconnected to said length of tubular member, coacting clutch elementsconnected to the lower end of said barrel and the upper end of saidlength of tubular member, means normally maintaining said piston in anadvanced position with said clutch elements interengaged to lock saidlength of tubular member to said barrel, and operable to cause saidclutch elements to unlock said length of tubular member from saidbarrel, and to permit said piston to be retracted in said barrel, and inwhich said screwdriver is permanently secured to said barrel and has aworking end retracted with respect to said length of tubular member inthe advanced position of said piston and advanced with respect to saidlength of tubular member to engage a screw head in the restractedposition of said piston, and a handle revolvably mounted on the upperend of said barrel.

1. Apparatus for wrapping the bared ends of wire conductors on screwtype electrical terminals comprising a tubular member telescopicallyinsertable over the head of a standard terminal screw and having at itsouter end a projecting tongue for wrapping the bared end of a wirearound the threaded shank of the screw as said tubular member is turned,said tubular member having a length greater than the range of movementof the screw head in moving from a fully retracted position to itsadvanced wire securing position so that such tubular member enclosessuch screw head throughout such range of movement, said tubular memberhaving a substantially uniform diameter throughout said length, andmeans connected to said tubular member and operable to turn the latter.2. Apparatus such as defined in claim 1, in which said tongue bendsinwardly from the outer end of said tubular member toward thelongitudinal axis of said tubular member, the degree of bend of saidtongue being such that said tongue tends to sweep the engaged bared endof the wire closely around the screw shank as the tubular member isturned.
 3. Apparatus such as defined in claim 1, in which the leadingedge of said tongue in the direction of wrapping turn of said tubularmember, is provided with a sharp edge capable of biting into a baredwire end when said tubular member is turned to wrap the wire. 4.Apparatus such as defined in claim 1, in which said length of saidtubular member is the length of the outer portion of said member, andsaid member includes an inner attachment portion having a socketreceiving a male connecting part of said connected means, the inner endof said socket communicating with the opening in said outer portion ofthe tubular member, and the largest transverse dimension of said socketbeing at least as large as the diameter of the opening in said outertubular portion.
 5. Apparatus as defined in claim 4, in which saidconnecting means includes a tubular shank having said male connectingpart formed on one end portion thereof and having an open bore extendingthroughout its entire length, a tubular handle member mounted on theother end portion of said shank so that the bore in said tubular shankextends through said handle member, the largest transverse dimension ofsaid shank bore being at least as large as the diameter of the openingin said outer tubular portion.
 6. Apparatus as defined in claim 1, inwhich said connected means includes means formed to provide an open boreextending continuously throughout the entire length thereof, such borebeing in communication with the opening in said length of tubular memberand havings its largest transverse dimension at least as large as thediameter of the opening in said length of tubular member, and ascrewdriver operable to be extendable from said bore and through saidlength of tubular member into engagement with the slot in a screw headenclosed by the latter.
 7. Apparatus aS defined in claim 1, in whichsaid tongue is inclined toward the longitudinal axis of said tubularmember, and including a wire containing cup which receives said inclinedtongue and into which is inserted the wire wrapped around the screwshank by said tongue, said cup having a depth sufficient to receive allthe wrapped wire and the head of said screw and having a diameter in theupper screw head receiving portion thereof such that the wrapped wirecannot be extruded between the side wall of said cup and the outerperiphery of the screw head as the screw head is tightened down on thewrapped wire.
 8. Apparatus as defined in claim 7, in which the side wallof said cup is notched to receive the conductor therethrough and inwhich the bottom wall of said cup is provided with an opening to receivethe threaded shank of the screw.
 9. Apparatus as defined in claim 8, inwhich the opening in the bottom wall of said cup is a slot extendingradially to and communicating with the bottom end of the notch in theside wall of said cup so that the cup may be moved transversely intoposition against the screw shank.
 10. Apparatus as defined in claim 8,in which the opening in the bottom wall of the cup is large enough topass the screw head therethrough and having a reduced portion to receivethe screw shank.
 11. Apparatus as defined in claim 8, in which the sidewall of the cup provided thereon a stop member engageable with a fixedelement associated with the cup to prevent rotation of the latter duringthe securement of the wire to the terminal.
 12. Apparatus as defined inclaim 11, in which said stop member is associated with the notch in theside wall of the cup and is configured to coact therewith as a guide forthe wire being connected to the terminal.
 13. Apparatus as defined inclaim 12, in which said stop member is substantially U-shaped intransverse section.
 14. Apparatus as defined in claim 12, in which saidstop member is composed of the material cut out to form the notch in theside wall of the cup and inclines downwardly from the bottom wall of thecup.
 15. Apparatus as defined in claim 6, in which said connected meanscomprises a barrel, a piston slidably mounted in said barrel andconnected to said length of tubular member, coacting clutch elementsconnected to the lower end of said barrel and the upper end of saidlength of tubular member, means normally maintaining said piston in anadvanced position with said clutch elements interengaged to lock saidlength of tubular member to said barrel, and operable to cause saidclutch elements to unlock said length of tubular member from saidbarrel, and to permit said piston to be retracted in said barrel, and inwhich said screwdriver is permanently secured to said barrel and has aworking end retracted with respect to said length of tubular member inthe advanced position of said piston and advanced with respect to saidlength of tubular member to engage a screw head in the restractedposition of said piston, and a handle revolvably mounted on the upperend of said barrel.